**Railroad companies have until the end of the year to be in compliance with Positive Train Control, and members of Congress made it clear Thursday they don’t want to add to that timeline.

According to Agri-Pulse, PTC , a safety mechanism allowing for remote shutdown of the trains carrying the nation’s freight, grain, and passengers, was supposed to be fully implemented by the end of 2015, but an extension was granted giving rail companies an additional three years to have the technology fully implemented.